如何使用空数据源显示Asp.Net Gridview的页眉/页脚？
答案 0 :(得分：2)
或者，您可以使用EmptyDataTemplate property为空数据行定义自己的自定义用户界面。
答案 1 :(得分：1)
您也可以通过为网格的DataSource分配一个虚拟行来执行此操作。 默认情况下，数据源将填充虚拟行。因此网格将显示页脚和＆amp;假行也是。 要隐藏行，您可以添加一个虚拟字段以显示是否显示控件。并绑定该字段以控制Visible属性。 最后，当您将实际行添加到数据源时...删除您创建的虚拟行。
示例 - 来源：
<asp:GridView ID="grdQualify" runat="server" Width="100%" AutoGenerateColumns="False" ShowFooter="true"
EnableModelValidation="True">
<Columns>
<asp:TemplateField HeaderText="Qualifying Exam">
<ItemTemplate>
<asp:TextBox ID="txtQualifyingExam" runat="server" Text='<%# Eval("QualifyingExam") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtQualifyingExamF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Roll Number">
<ItemTemplate>
<asp:TextBox ID="txtRollNumber" runat="server" Text='<%# Eval("RollNumber") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtRollNumberF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Admission Round">
<ItemTemplate>
<asp:TextBox ID="txtAdmissionRound" runat="server" Text='<%# Eval("AdmissionRound") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAdmissionRoundF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Marks Obtained">
<ItemTemplate>
<asp:TextBox ID="txtMarksObtained" runat="server" Text='<%# Eval("MarksObtained") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtMarksObtainedF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Marks Out of">
<ItemTemplate>
<asp:TextBox ID="txtMarksOutOf" runat="server" Text='<%# Eval("MarksOutOf") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtMarksOutOfF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Percentage">
<ItemTemplate>
<asp:TextBox ID="txtPercentage" runat="server" Text='<%# Eval("Percentage") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtPercentageF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Remarks">
<ItemTemplate>
<asp:TextBox ID="txtRemarks" runat="server" Text='<%# Eval("Remarks") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtRemarksF" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="btnDeleteQualify" runat="server" Text="Delete"
Visible='<%# Eval("ShowVisible") %>' onclick="btnDeleteQualify_Click"></asp:Button>
</ItemTemplate>
<FooterTemplate>
<asp:Button ID="btnAddQualify" runat="server" Text="Add"
onclick="btnAddQualify_Click"></asp:Button>
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
示例 - 代码：
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (ViewState["QualifyDetails"] == null)
ViewState["QualifyDetails"] = new List<Entity_StudentAcademicQualify>();
GridDataBindQualify((List<Entity_StudentAcademicQualify>)ViewState["QualifyDetails"]);
}
}
private void GridDataBindQualify(List<Entity_StudentAcademicQualify> list)
{
if (list.Count == 0)
{
Entity_StudentAcademicQualify studentQualify = new Entity_StudentAcademicQualify();
studentQualify.ShowVisible = false;
studentQualify.QualifyingExam = string.Empty;
studentQualify.RollNumber = string.Empty;
studentQualify.AdmissionRound = string.Empty;
studentQualify.MarksObtained = 0;
studentQualify.MarksOutOf = 0;
studentQualify.Percentage = 0;
studentQualify.Remarks = string.Empty;
list.Add(studentQualify);
}
else
{
list.RemoveAt(0);
}
grdQualify.DataSource = list;
grdQualify.DataBind();
ViewState["QualifyDetails"] = list;
}
protected void btnAddQualify_Click(object sender, EventArgs e)
{
GridViewRow row = (GridViewRow)((Button)sender).Parent.Parent;
List<Entity_StudentAcademicQualify> studentQualifys =
(List<Entity_StudentAcademicQualify>)ViewState["QualifyDetails"];
Entity_StudentAcademicQualify studentQualify = new Entity_StudentAcademicQualify();
studentQualify.ShowVisible = true;
studentQualify.QualifyingExam = ((TextBox)row.FindControl("txtQualifyingExamF")).Text;
studentQualify.RollNumber = ((TextBox)row.FindControl("txtRollNumberF")).Text;
studentQualify.AdmissionRound = ((TextBox)row.FindControl("txtAdmissionRoundF")).Text;
studentQualify.MarksObtained = Convert.ToInt32(((TextBox)row.FindControl("txtMarksObtainedF")).Text);
studentQualify.MarksOutOf = Convert.ToInt32(((TextBox)row.FindControl("txtMarksOutOfF")).Text);
studentQualify.Percentage = Convert.ToInt32(((TextBox)row.FindControl("txtPercentageF")).Text);
studentQualify.Remarks = ((TextBox)row.FindControl("txtRemarksF")).Text;
studentQualifys.Add(studentQualify);
GridDataBindQualify(studentQualifys);
}
protected void btnDeleteQualify_Click(object sender, EventArgs e)
{
List<Entity_StudentAcademicQualify> studentQualifys =
(List<Entity_StudentAcademicQualify>)ViewState["QualifyDetails"];
studentQualifys.RemoveAt(((GridViewRow)((Button)sender).Parent.Parent).RowIndex);
GridDataBindQualify(studentQualifys);
}
答案 2 :(得分：1)
我在网上阅读了很多关于此的帖子，最后我提出了我自己的解决方案，满足了我的需求，并希望其他人的需求，包括这个问题。
显示页眉/页脚的需要可能是因为 1）我希望用户看到网格的结构，和 2）我想使用页脚向表中添加新数据。
因此，只需显示“没有数据可用”＆＃39;是不够的。
所以我的解决方案是测试数据是否可用。如果没有，则创建数据源的结构并使用默认值填充一行的必填字段。这很重要，因为如果在布尔和日期等字段为空时将数据源绑定到网格，那么您将拥有＆＃39; DBNull＆＃39;错误。然后将此新数据源绑定到网格。然后按此顺序隐藏行。
Protected Sub BindGrid()
con = New SqlConnection("mainLocal")
Dim da As New SqlDataAdapter("SELECT * FROM Test", con)
Dim dt As New DataTable()
da.Fill(dt)
dim rows as integer = dt.Rows.Count
If rows = 0 Then
Dim dr As DataRow = Nothing
dr = dt.NewRow()
dr("isActive") = False
dr("Dated") = Date.Now()
dt.Rows.Add(dr)
End If
Me.TestGridView.DataSource = dt
Me.TestGridView.DataBind()
If rows = 0 Then Me.TestGridView.Rows(0).Visible = False
End Sub
我想更简单，更短，更整洁！